1978 Custom Credit Australian Indoor Championships

The 1978 Custom Credit Australian Indoor Championships was a men's tennis tournament played on indoor hard courts at the Hordern Pavilion in Sydney, Australia and was part of the 1978 Colgate-Palmolive Grand Prix. The tournament was held from 16 October through 22 October 1978. First-seeded Jimmy Connors won the singles title.

Singles
🇺🇸 Jimmy Connors defeated 🇦🇺 Geoff Masters 6–0, 6–0, 6–4
 * It was Connors' 10th title of the year and the 84th of his career.

Doubles
🇦🇺 John Newcombe / 🇦🇺 Tony Roche defeated 🇦🇺 Mark Edmondson / 🇦🇺 John Marks 6–4, 6–3
 * It was Newcombe's only title of the year and the 65th of his career. It was Roche's 2nd title of the year and the 27th of his career.